class Person{
    constructor(name='laowang',age=18){
        // 在构造函数 - 声明属性
        this.name = name;
        this.age = age;
    }
    run(){
        console.log("跑起来");
    }
    static down(){
        console.log("坐下来");
    }
}
class girlFs extends Person{
    constructor(name,age){
        // 超级 - 继承父类属性
        super(name,age)
        this.weight = '180斤';
    }
    jump(){
        console.log("跳");
    }
}